Improvement in steam safety-valves



G. H. CLEMENS'.

STEAM SAEETY VALVE.

No. 112,222. Patented Feb. 28, 1871.

l i Y, illllr `chamber communicating with the boiler.

fitte GILBERT H. CLEMENS, OF CHICAGO, ILLINOIS.

Letters Fatent No. 112,222, dated February 28, 1871.

IMPROVEMENT IN STEAM SAFETY-VALVES.

The Schedule referred to in these Letters Patent and making part of Athesame.

To all whom it may concern:

Be it known that 1, GILBERT H. CLEMnNs, ot"

Chicago, in the county of Cook and State of Illinois, have invent-edcertain new and useful Improvements in Combined Steam Safety-Valves andWhistles; and I do hereby declare the following to he a full, clear, andexact description thereof, whichwill enable others skilled in the art tomake and use the same, reference being hadto the accompanyingdrawingibrining part of this specification, in which- Figure 1 is afront elevation oi my invention Figure 2 is a vertical section of thesaine cutting the whistle through the center, showing the external partsot'v the valve-case;

Figure 3 is a vert-ical central section of the valvecase taken on aline, a u, with whistle removed; and

Figure 4 is a cross-section or plan taken on line l (I.

Similar letters of reference indicate corresponding parts in the severalfigures ol' the drawing.

The object of my invention is to provide a selfolosing safety-valvecombined with a whistle for `steam-boilers, each being so arranged as toperform their separate and necessary function and rIhe improvementconsists in providing the lower portion or base of the valve-case with areceptacle- \Vithin said chamber is secured the main valve, which is soarranged, together with the arrangement of the case,` las lo forni alateral enlarged supplernetal-chamber between the lower side of thebulk-head or c ap of the base and upper surface of the valve, into whichthe steam is admitted from the receptacle-chamber, by lwhich the valveis iirrnly secured in a closed position by the pressure of steam againstthe upper surface of the same.

Also, in providing said base with a hollow tube, within which is secureda prhnary valve having its seat upon the upper surface of the bulk-head,and communicating with the receptacle-chamber through the main valve, bywhich means the steam is couiined in said supplementalchamber, orallowed to escape therefrom by the opening-or raising of thc same. n

Also, in the manner of seeming the base ofthe valve-case to the boiler'or do|nc-plate of the saine.

Also, in the combination ol a steam-whistle with the saiety-valve, adescription oi' which in` detail will bchereinaltw fully given. f

in the dra\\'ing f l A represents the hase of the valve-case, the lowerenr`lot"wliich is ground a steam-tight joint, and

Vfitted upon the upper surface of the dome-plate B ol' the boiler.

C is a screw-threaded disk, which is firmly ailixed within said case,and is provided with a series oi' The upper end of said case isscrew-tlueaded externally, upon which is fitted the bulk-head or cap F.

The lower portion of said base is provided with a receptaclesteam-chamber, G, which communicates with the boiler thronghth6-openingsv ct ot' the disk.

The inner side of said base at the upper cud of the receptacle-chamberis so arranged as to form a valve-seat, upon which is fitted the mainvalve H, by

which the steam is secured iu the case.

Within the sides of said ease is a series oi' openings, d d', whichextends inward and upward from the outer side of thecaseeto the mainvalve, through which the steam escapes from the receptacle-chamber whensaid valve is raised.

Ilieupper lsurface of said valve H is Slightly con- 'cave toward itscenter, and is so arranged as to form a supplemental steam-chamber, G',between its upper side and the lower surface ofthe hulk-head or cap ofthe basc,thc horizontal area of which is near twice the area of theupper portion of the receptacle G.

Aiixcd to the upper portion of said bulk-head or cap is a hollow tube,I, the lower end of which is screw-threaded externally, by which thesame is attached to the upward-projecting portion F' oi the hulk-head. i

Within the upper end of said tube is a sorewthreaded' coupling, J, uponthe outer s ide of' "whichiis attached the cap Jo'f the tube. l

K isl a primary valve, which is fitted Within the upward-projecting"portion Il" of the buik-head, below the end of tube Land is soarranged' as to admit of a 4slight vertical movement, the seat of saidvalve being formed in the upper surface of the' inner portion of'thesame.

Attached to the center and lower port-ion of said valve is stem e, thelo'weiend oi' which is slightly enlarged, and is looselyr fitted withinan aperture, f,

in the center of the main valve H, the diameter' of said aperture beingsuch as to allow the steam from the receptacle-chamber G to pass throughthe same around the sides of the enlarged portion of stem c into thesupplcmental-chaiuber G'.

The upward-projecting portion F of the bull'- liead is provided with aseries ol' openings gp through which the steam escapes from saidsupplemental-ehamber when the primary valve 1i is raised.

Aftixed to the upper surface of said primary valve is a stem, L, whichextends upward through tube I, and is provided at its upper end with abolt or rod, h, to which is attached a stirrup, M.

'lhe lower end ot' said valve-stein, near the valve, is slightly'enlarged, forming a shouhler, upon which is supported a collar, ai,which is loosely fitted around the same.

Upon and around the said valve-stem, between the upper surface of saidcollar and lower cud of coupling J, is a coiled spring, N, which is soarranged as to hold the valve iirmly against and within its seat.

Attached to and around cap J ot' tube l is a colf lar, O, which restsupon -a shoulder, on, formed ou the lower portion of said cap.

. he said collar is secured in properV adjustment by a set-screw, n,which passes through its side and against the side oi'v the cap.

Aiiixed to the side of said collar is a vertical arm,

P, to which is pivoted level' (4),.

Firmly bolted to the outer side of said arm is a curved spring, It,which extends outward and upward against the lower side of lever Q, bywhich the same is secured in proper position, the said spring being soarranged as to allow the outer end ofthe level' to be moveddmvnward whendesired, and to forcel the same back to its normal position as power isremoved trom the lever.

livoted to the forward end of said ieveris a stirrup, S,'to Ythe lowerend of which is attached the whistle-ring T, the same bfiug so arrangedas to admit ota vertical movement.

The said lever is torked-shape, andv is also attached to stirrup M of'the primary-valve stem by means ot bolt p passing through the same,said bolt also passing through stirrup b, thus properly connecting thewhole. l

' Stirrup M is provided with a vertical mortise, 1', through which saidbolt passesfthe length of said mortise beingsuch as tm allow the levertobe tilted; upward suliciently to raise ringl nearly to or against theHannes ofthe base as boltp is brought-in contact -with the said stirrup;thus the whistle-ring is raised to its proper position beforev the'steam is discharged ii'om the respective chambers by the raising ot' theprimary valve.

Atlixed to the upper end of said stirrup M is a rod, t, the object ot'which is to raise said primary valve independent of the whistle-l'ing,the length of the xnortise being such as to admit of the same.

lhe upper portion of tube I, below cap J', is screwthreaded externally,upon which is fitted the whistle case U, said case being so arranged asto admit of being adjusted to a proper position with the openings gg ot'the buik-head, and is firmly secured by a screw-tlneadedwasher, V, uponsaid tube, above the same. V

I provide the upper portion of' the base A with an'adjusting-nut, A',which is fitted upon the screwthreaded portion of the same between itsshoulder and the shoulder of the bulk-head or cap,l1`, the object ofwhich is to secure a steam-joint, and to rhold the said bulk-bead firmlyin position when adjusted to the required height, thereby graduating thespace, vertically within the supplemeutal-chamber.

I do not wish to confine myself' strictly to a screwtln'caded disk, C,as described, as I sometimes construct the base ot' the case and disk inone piece with the proper openings, either of which will produce thesaine result.

Nor do I wish to be confined exclusively to the bolt or rod 7a, bywhichstirrup M is connected to the primary valve-stein, as a chain may beused to connect the saine and with-the same result.

'lhe manner oi" att-aching my invention to the boiler and its operationis as follows:

The yoke E is first passed through thc hole in the dome-plate B, andbrought to its proper position under the same. Base A of the valve-caseis then placed upon the upper side 0f said dome-plate, and bolt D passeddownward through disk C and screwed firmiyinto tbe yoke, 'lhus the saidcase is firmly attached to the boiler, and as steam is generated intheboiler it tlows into chamber G ot' the valve-ease, through theopenings ab ot the disk and dome-plate, filling the said chamber. Thesteam then passes through the opening 4in the main valve H, around theenlarged portion ol the primary valve-stem c, into the siuiiplementalchamber Gr', filling the same, by-which means the main valve H istightly closed by the overbalanced pressure oi' steam upon its uppersuri'ace.

lhe primary valve K being arranged to weigh the 'steanrin -the boiler,and as the same exceeds the limit allowed, the said valve is raised fromits seat by the pressure of steam against the lower end'ot' stem c,which allows the steam within the supplementalchambcr to escape throughthe openings in the bulkhead, thereby-reducing the pressure against theupper surface of valve Hs"utlicient to cause the pressv ure beneath thesame to overlmlauce that above, by which the said valve is raised, andthe steam trom the boiler escapes over the valve and, through theopenings il' d oi' the case. v

'As soon as the steam iu the boiler is sufliciently reduced to -bringthc pressure Vwithin the limit required, the primarywalve reseats,`amlthe supplevmental-chamber instantly fills, thereby closing the Vmainvalve.

Y seat, consequently giving greater surface for the steam to act thereonand a greater pressure upon the springs when the primary valve israisedfrom its seat, and, at the same time, reducingv the Apressure ofthe steam in supplemental-chamberG' downward upon the upper' surface ofsaid enlargement.

Having thus described my invention, What I claim as new, and desire tosecure by YLetters, Vvlatent, is-

y main, valve. 1I, the whole arranged substantially as Aand for thepurpose described.

3. The enlarged stem e ot': the primary valve K, in coinbination'withopening f of valve H.

4. The adjusting-uut A', in combination with base A and bulk-head or capF, substantially as and for the purpose described.

5. The bolt D and yoke E, iu combination with adjusting-cup T andwhistle, substantially as and fol. base A, the whole larrangedsubstantially in the mauthe purpose described. ner and for the purposespecified. Y

6. The combination of the strrup M with lever Q, bolt h and valve-stem Lwith spring N, substan- Witnesses: tially as and for the purposedescribed, N. C. GRIDLEY,

7. In combination, the steam safety-valve, with N. H. SHERBURNE.

GILBERT H. GLEMENS.

